amp gauge flickering, lights too! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71/454 · 05-08-2009, 12:41 AM

Hey guys,
My 72 has the amp gauge flickering really hard to the charge side intermittently. I thought it was the gauge till I drove it and the headlights flicker dim to bright. Meter on battery says 12.17 at idle (seems low), hits 13.30 if I rev it. If I meter the output stud on the alt it says 12.82. Oh and it doesn't seem to act up at idle, just while driving, somewhere around 1500-2000 it seems to start. It has an internally regulated alt swap and previously worked fine. My first guess was the alt was going out but I changed the engine this winter and I think this has been going on since then.

05-08-2009, 12:41 AM	#1
71/454 Turbo Guy Join Date: Jan 2005 Location: Calgary Alberta Posts: 353	amp gauge flickering, lights too! Hey guys, My 72 has the amp gauge flickering really hard to the charge side intermittently. I thought it was the gauge till I drove it and the headlights flicker dim to bright. Meter on battery says 12.17 at idle (seems low), hits 13.30 if I rev it. If I meter the output stud on the alt it says 12.82. Oh and it doesn't seem to act up at idle, just while driving, somewhere around 1500-2000 it seems to start. It has an internally regulated alt swap and previously worked fine. My first guess was the alt was going out but I changed the engine this winter and I think this has been going on since then. __________________ 1972 Gmc Custom swb intercooled twin turbo 327 10.5-1 and 12 lbs of boost, Nodular iron case super t-10 4 speed with a blowproof bellhousing, 12 bolt eaton posi soon to have moser axles. 1998 Honda CR250 fully ported, case matched, milled head, vortexed carb and revalved suspension but don't forget the woody woodpecker decal kit! Things I've broken so far: 12 bolt diff saginaw 4 spd many, many pieces Aluminum case Super t-10 4 spd



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